New thickener based on s-triazine di-sulfanilic xanthan for reactive printing of silk fabric with double-sided patterns

Abstract

In order to achieve good double-sided printing patterns on silk fabric, a new thickener s-triazine di-sulfanilic xanthan (TDG) was prepared by chemical modification of xanthan gum (XG) using alkali and monochlorotriazine di-sulfanilic acid (TS) as modifiers. The structure of TDG was characterized by Fourier transform infrared spectrophotometry. Rheological behaviors were investigated by steady-shear, dynamic strain sweep and step-shear tests. The results indicated that TDG showed better flowability and smaller structural viscosity than XG. TDG always exhibited the viscous effects under external forces while XG experienced the transition from elasticity to viscosity. Used as a thickener in reactive printing of silk fabric in screen printing, TDG obtained much higher screenability, color yield, penetration and outline sharpness than XG. The double-sided printing qualities of TDG even surpassed those of sodium alginate, implying great potentiality of TDG as a good thickener for double-sided patterns.